At 07:02 24/02/2012, Kawthar Alajmi wrote:
>Hi all,
>>I am running Stepwise logistic regression and i have :
>1- Multiple covatiates included in each model (No missing data)
So there is no missing data on any covariate?
>2- Genotype data (SNPs) about 500,000 .
>I partitioned the data to multiple files (there are missing data)
And now there is missing data on some of the covariates?
I suggest you revisit how you partitioned your dataset.
I also suggest you get some local expert advice on the risks involved
on doing half a million logistic regressions, let alone half a
million stepwise regressions.
>I run the step by including all the covariates and one SNP at each model.
>>but i got this message :
>> number of rows in use has changed: remove missing values?
>In addition: There were 37 warnings (use warnings() to see them)
>>How to overcome this problem ??
>> [[alternative HTML version deleted]]
Michael Dewey
info at aghmed.fsnet.co.ukhttp://www.aghmed.fsnet.co.uk/home.html